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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440f687b0c4860b4f18c34e654ba9347421cf365cef339a01bb4ade4ed199238' 
  AND token = '60ElLdBPL0eklqZ6zyHBsKqAnBh/xkh2xT2lwS4wem0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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