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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc79dc0aa59361cdea8f4bddd24b23025c95fba689f56ce1eefc7c839cc62367' 
  AND token = 'Qe9k3OroldnsHQAlWsLW3CHPOam9Ic4bJNzqEi7ORUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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