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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284a801e634100fc42f80526ebbd63a8ff673a865efec913406d9da2b68ae519' 
  AND token = 'kQiC3GyzVK1m6TPfNGW6qa0DPXrwFt/Nzg3I7GOegRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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