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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7028b127f6d402835ca4b74c1bf3e34be87a44b74a98261fe8058d340f6a57' 
  AND token = '20gpg+/AU+Nk3QMVjP2CbNv+1tgV8tkO++OSoBP9s90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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