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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f196176857effc7da4df3a865500e4b77e9382d73fa3763b4f1514466a06a0' 
  AND token = '1e2JohYn9XwxTVUeLyf4GnWzh4DfFAfIbi0yWkfTzFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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