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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6746f4a80313df1b161c945fa48b47eacca15c76a4747f7daab82366c54f60e' 
  AND token = 'YlS9Z2Bizg9Sx8KxfcqoQmLaU+H+p3sOuIxmnAcPP18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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