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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47cfa861032e6a7171f9c10f9bd12acc5bcce0ecf54e8609cb4af24427d62abe' 
  AND token = '4TVMmNewSWXk7+nmirfL3gHq+4nfLbzi+yTA0h8UsPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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