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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ba10e1ed2fa280e0bb8fd822a783f89af4ca91723248428bc049550c600470' 
  AND token = 'imwc1trhk/RblrwsgK0Nnj24icWqC/T7mIii3nI+diA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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