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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5400fdf12aec91b7e524f2a16faf329a71af050c1cf14339419db847b7e073' 
  AND token = '1tepjRLADxJvwEqVB7IQbPO9sQ3M3V0HYgWcnlbnFpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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