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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b42c7555b045a6fc44b8463c058f189d75f9b4726d61d7b814c6071f67b7ae' 
  AND token = 'hFC9lmGJONoSZbfTqjsjXG94Mk1OEhFm0Qkm8DwkVxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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