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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d7d85a6ae93588a5c7eb989fb843e3cf03707926b0f683e245b1494279deac' 
  AND token = 'ls9bNHBVTDEnEWCETKlO3A7MNs40UZZJ/+uxlwLJa8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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