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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ee4723f1cff438b545a4a9ac7620dd0df460665b4a1c7f5324d07e2614e155' 
  AND token = 'stk5hk2WOX44gdtm4Od6CyKS3JlPsEBa2dwgBrfnaf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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