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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c5eabb419fb35a56739f2fb053ed2ca9a573ba2711129a6a53eb9825f586e0' 
  AND token = 'lEgNa4bZeJOkJ70TZKMW7y/svcDf1Zl7Mlhmfi57H48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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