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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31da7728616f5b01ef90a454957e13073e4466e44ad390f68917c35ff7b9b6f8' 
  AND token = 'AZZblxfuqHTl6ZdlashSpF4ciVMFfAvVtrriYBDA+mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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