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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d42f1e98ec710ee10d7797327c3da661ded97baf3b08eed4787446ced1574f4' 
  AND token = 'KLiRcxjunAorwm17b+X7CcaLEtg2xWf/88p+WInJru0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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