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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62739e3e0f1d2f6290f5633a89dd85b554e6601e5841e4936de637a78fd093d' 
  AND token = 'cGMTiDQbKCZKdrS+n0Zgk91i819RtD6JziersuEr8uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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