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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841bcbf440c6adc449a4d3edb9f5e151b48b7da21303e1a495489b4bf6d1655f' 
  AND token = 'LtxylhIeEKSlvX3X8jT3FmpX1io+E6T5FKyV+NVHjcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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