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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c836aeb57afc5de7ead1f1cbc5fececb0511932b95542926b6d78bb02e20b935' 
  AND token = 'kdjULmMj5kabE87H1d5Fa5HknTdXNDT/2qVcDpRP2qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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