SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8166455ddb3241bc8b07721f5ddf2216cd8afed9c894193f07305b73018cb697' 
  AND token = 'kCuGAWfVTLcAI/mXJmwYjFO1MyRz/o+pJOVMcwoHS/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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