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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39490b0af94c06d663bed5cdc14980b6d332f55fcda7ae29ea771ba74e8ae51' 
  AND token = 'gI5GsautG3a7FqTXoxJlbJe5DhSqaD5Glj3ov0yczVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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