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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f707111cb7043f9a4e4d653a6ac080be84f345fb3d68456ffae1bfaa05bf342d' 
  AND token = 'tZaMLRinrDO+ONI3Zi3U/Yomzb/z+ykXCz61nB0P4PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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