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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eff92dd426caff5bb4ecaddfccd352cf2580dc9c5530660c1d3882c528678c0' 
  AND token = '7afi4rUn9wRsLrY+EHlBcRzO9v4jL0DpTaTr+dnG7Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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