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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c751faea8978156293003ef95b1f3a5ce3311a7987948f21805d926848b9620' 
  AND token = 'tvPhuq9y6UvBakW61BtAavpl7Q6JM3akf/sFkZUo0js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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