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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68fcffd54d5ea7e7cf060b9b4985e0a112e560ef877d3afafb1a2f1aea0421fa' 
  AND token = 'ioFWM0FiAxqmqK37JeYzfLydKz5OpbGZ7UXl2PbHmwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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