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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa955baab6577f47b835184a771dc2b5aa475813d910ea8ded97953106f9a87a' 
  AND token = 'sJW23rB6uam0drinU6dg8Wg1CmwxPulndOe4SHA2BvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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