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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae9ab0a23c694076d83d99ffe1693fa16a46481dd2a478cd41feb67a5c44ca7' 
  AND token = 'dntX4C3e1PXVFWG8Ubc8QQYVFHoOhWL4/6+zEZj8YnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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