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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70cd7716a57a4cf836ac579ef3bd4f89df8d9a44f5b76b75d75b8b7f7dee8ea' 
  AND token = '5lA4J2FOvIouF5ujntIeIE4oLZ0qbU+lvTMIoRsqNfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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