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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e81b34af40ab12a168f7e8a99be2821da81ab8f89649f9b8530b8c7e4191af' 
  AND token = 'ml9eX5ju+rIfmrG4XiZoEBDtgyWla18npSjwo0bJEQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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