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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d8348d777364bca53dd1e58c57e9d4f8722b43fa109d394b0a85b79026f123' 
  AND token = '/QcVjOyJ1ghuqEHg8GbPk9X1b0cCEylTT0l1+MoQbUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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