SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c96ca67b179f649b2caa524df31edd2e886bfb95c2526997911d7f23a172b93' 
  AND token = 'yhVAa8pPxBdOtUY/w5l1on1/Oqo9hMkJvjmufq9GH+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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