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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03da1f6623ecfcbf33c34c0271d046bae0c3fc7e7ce757fcf56ca68069b6fe7' 
  AND token = 'hNq76W0FLLXAX8Q0yO8UNTQxZuL7NJmSaGgeRuxxs4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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