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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb40c765d5cbe4854c98fa8f39a182f6ddad00f0eac73b79a8db0940f728e7be' 
  AND token = 'Htj5q1EodkuuXU33bRiNldO7CIoaIDOPPC6NkTcHW+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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