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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cc4d1beab1be408753baf49fb69a3cfa381409e4394399ebc4482eb92f1dfd' 
  AND token = 'nTNppsBbkRg01XItjlaX6WWDs7h9hlbZNteDMW9hl+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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