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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a3bd1ef853821e5301b5e0fe5ebc811bbc5877af6f2ccf8ac4c510d092281d' 
  AND token = 't2YR1QWofUtpl7Vq6FdUxSL0f6pPfQq4xPMLEAy25Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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