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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae5df1bc2bfbfe2acd9db01beae6bf7e07bb8b761bf2ce91595b558687b6a5f' 
  AND token = 'n7Fh0XYmXpkwRB5vDnHQFO92dn8doteFttNpoJT8BuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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