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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9394d694b66ddab70d09a6e1faf0532634fde5ea6e2eb19aa91f09cd581240' 
  AND token = 'U6UFbamvkRPsuNRwRXmaMIJUuPfOMoJKelPrig2dR1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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