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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f459893530857162174ff175a28eba332a24ce8f004b3e082707c051b6b9ae2e' 
  AND token = 'UXyNDLIDxTp3sve8bcLLAmh/92CFk1AAz29Vi2NhFOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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