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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837217b8a29cfbf34b3784533960bd860f949743aaede2f51e5667d003ef7229' 
  AND token = 'tYiu13HhKF273D8VkP7brZjb9ZmYLy854FXzLuthDJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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