SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a45927c76afb6bc451381faf0606c0549bf62df4faf2a003283df5e43b1a945' 
  AND token = 'vVrlJQPdc7pZoC/KPjF5ErtzqO2dzVyfDKLCYGhyTXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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