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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69477bf5a9af69a1bd7d211396b423d0276db576663569e39e469541af40c483' 
  AND token = 'w5Cr3HfIsUEnBhoUm/eIp5OJ8bH6MYVmpswYMLpJI2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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