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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760a7da9bfeb9ff3ed86e94dc64c5d9d61ce280683878e11b094674baf050350' 
  AND token = 'N89MbC+LM1ZBy7eSq+/0rre2I2BX5LGFUVK5i/K9OAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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