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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca88993f500f66f8ef88d5249b02b8e4842ee77af2743b4071f1f7cb4a8d6a70' 
  AND token = 't+U79OHgZVwywUG8u1AT4Gk2k3V3LI6rGVLu9Zu+1ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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