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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4edae05a6ad29c1f6afb7ef5b979ce547aa119bade075817b8cd3f66f36d19ad' 
  AND token = '7KTF5jT0HlPtm8/F03sJi1GH0+f2ZeEQee+YOnzVwAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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