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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28b90f8f55b546e876c625e2fe43c2112b5a9b8d8caf3b326367ce51ac9c928' 
  AND token = 'UtztP+wQzaudi80f6vRh/7oTAk94FttvKpqw1t/2aEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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