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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b857180eeee698ccb281891d6a9830405aab83f0baf5b9f382526102aaafa8d' 
  AND token = '1T2WHbawulJj0/0/02tnUBp8hxEOXIus5h5xa8Q3n4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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