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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd7e493003c23903bd0ceeeba179f58acb79faea2a90530ca572ee6ec78aea0' 
  AND token = 'JHSzEenhQDCVXDEsgYTKOUTM//5dPWdt8er/WBI2DXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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