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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696dfcbb4d6a780838c338c6801ade0b638cd3b3c8d4b2a87a61bd6ff00a3bae' 
  AND token = 'qQXn9ovd+jDSKVEMAYrWIMg4jg3CHZTDqezJlwva/5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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