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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015db141e5e05e282c826a9cb28347d8ac1b3aa590ee25a13e6848a8064bfe27' 
  AND token = 'UXUDGIvgaDTHqAkLsBZ3SMA5GZozVQ+vBseN2lBHxYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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