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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8257a20b6b2b17ffed6ecf2bad01f2f38a305751aa126986f8c27a69faa8d2a7' 
  AND token = 'KXKNz9hA5W6vhNCz42uZ5S45ATKHaQYjO4GTWbd8N24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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