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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a66d71722b1b6a2427c00ddf1f524a25bd599cfaa7e3b635ac69e97a8bb513' 
  AND token = 'HegCa2WBn0hF6ROYClCOx+1BB6TNNN/7w6qwVLCCy14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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