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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3fe5d686421da804a44c394b1f48ad3573a9d95784ee65a98edac27698cee41' 
  AND token = '3SyfYZrArwKs6VULuT+AaOHGHF6I4EtI2And0xqPuWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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