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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae863c3e205223b7ffd7cbf571fb91d127bf0ee34317cebcffe1e74dc821c103' 
  AND token = 'Z+c8LWNhUpvV5lT3qjXl2N35fuZceggA2iwB3in68M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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