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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f699d073b4b8d16e3784841ea6c89efc428423372c346e2d8aabf2538038cf' 
  AND token = 's9VTH1ehUhb7pe3xaYllGdbBseoj1pSrxE+6gniuwFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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