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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c99666b3a5536d641f9f48a8ac561709fb7276719cbeafc916f7384cec31e7f' 
  AND token = '0njw62WUo46mAt79kqiIhWt6IhXsGd6q2ZofCs4m5dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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