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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf7a26c62c9854e0de71aa57ad86ac0c89eb7970cd7852547f2293ff7d17f66' 
  AND token = 'sC52Q5deqrhdFTqjtf+YibolHdi71XnTxtJLAWuwT3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}