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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923e513e4a92552a04a8d34da72c5a3ea5308cda60e8ea5f8dda7f4f5dae93ec' 
  AND token = 'luL2MeBq7g3d7pXSQUAwkZHK9giPA2kONZGirJ3/QHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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