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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06c821c0b1ba173733e143c276d88bc5e8cf19b1e1532e174540a53ecdc877f' 
  AND token = 'L9BOO9rCcqUGa+8X75TptC2o8hFa8i7AFL8qXPXwE6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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