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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a713afb11773e526856bf21c05ce047eed425a65a8faf7c353d10eb3aa550b6' 
  AND token = 'Pn1AJ9qMbHROyx4V48QSteLYY2QvyzILaB/UXMvQRas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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