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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07883ee38c1d201c68c5fe0dad1ace7db63c815ed7dd3368eaf905e0ac3df33e' 
  AND token = 'uC3lWX0V3LJi8a4Qj41GFoWSJznCjTnyJr+b4VJL7Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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