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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851eb873ef366da90442385cf78e3f587847c2d71caf9b20b81f940fe8f36ed6' 
  AND token = '9SZX2Duq/1Kve/fZqXOHq/hSJW6dIav1q40U4fDPW8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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