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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d22a205bac6f8ec3bd9dcf78bfb4a68e5ff01fe7d9337389ac70c9fbae489f1' 
  AND token = 'I10qKrc6qaua+C+7+WshLFy1UFdcjlwEBhQH70T/brA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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