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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd285d33d49500ee33887419ad996a5fd82d250b06894cd54f533817b2e5a591d' 
  AND token = 'EOigoeHHOOsDzMvw6iGmcudn8ithzUtLtuQemBt1UrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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