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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5633f1577b5d54a717bafa95b3d383aeada761ca1e94bef1784c4738709d149' 
  AND token = 'fHFFHtZmwYREttUi6vgTU/2+OpfAG7nM5TlbjGoojaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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