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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a63c7bcf00c1daf8ce675bca4665247f695fcd650184fb6d5e9dce257755dae' 
  AND token = '7wm07Md3AJltLCJCeHpbN3E/leIicdAWO561EfMp9kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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