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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47601bb21285d6e043edab294bcce79c2f50b01d81fc4151625157e27a64ec7a' 
  AND token = 'UBlFKIt8xHro58CLhM8VTGwq11ZNiHUdGws9GcCXcgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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