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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be2e2702c9ca72566f5bd6d3e9602550154f61cf456ea3347501c3115bff183' 
  AND token = 'sADcnflfe1Oizo7ZfmCHZOBywCPGcACysbIA7k0GUQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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