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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e42e9ba922d60fd6ad593f570efe48f4630c83c2bc7d3d0ed55a0181b66cec' 
  AND token = 'YoWzTdQfskQuYRLVIJIg9PIxjYdWgX0STo6A/z1jQdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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