SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2be5140f80ea8968c34d653a668f178be8b2235ef9529c51fff497bef8523c6' 
  AND token = 'ChmVMMYIPpctBSr9L3vRpwDzgtnWLSxkSJEYXMK/uLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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