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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a088c8492c9b8e589a5ceb035a27ae938868ca40c87fb3282f9e3c94ae920d84' 
  AND token = '8uRskdZ9wlq9kFWBokxOHVIP5g0rK7CIEzuxH+B/XHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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