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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd658d8ce5108551c7b3e920f0cea8aacb6489178453fd93fd0fcb618747b25d8' 
  AND token = '83QxDFfSZF/1IVrY+tegqjfA6f03qDavtRIiksiBpM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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