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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7890e9951fbcf57c1b097eb4c5c641fc1e9e01d354ec4f46166c554d04fabb4' 
  AND token = 'J9z5h0h01AOCY3VNEFMdZJYSQd9+Ha450i9sN7CnuHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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