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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f90b4b8d611c7d8519adc36404b570d9fb499284564ce8e49ea09ee077b4b4' 
  AND token = 'X0CJ7TNB+iB+066IYTQrJEsftoK6IGPCTdgqOG6jNtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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