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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894f091d2e83b54109885e75267278f80433f5b9221de898de33f8f941c00f07' 
  AND token = 'SKh5KInDnd/Br2bpfOW4ofq5LMbhxu+gDskP1M3M0/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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