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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ffd81c302df7f2af7f9df70f1b68f931f43ff0c5bbd77de9582693bda9814d2' 
  AND token = 'BfqHNaQEUcT2BtF1ikTGUICaa7zhX4X3pPrJIFNP5Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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