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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539600a6563fabc3b826e7054bf30cae26a968231f3f03451a6f93c1ff5cc241' 
  AND token = 'TDDSByL/e+OHkDoebbwtl1WxFhDTAVlxpE80lR/1Oeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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