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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b043e5f776e223caa749400cdbc9346563b3a0d8bb4ad88a8593fbd0daa586d' 
  AND token = 'TLxYO16gsifxy5HilD3L1Qq6BdMQmuSn80wNS3q5GUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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