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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020841051948e11b15bc8064f2092b82413ac67b44a8850048354f68b35085a5' 
  AND token = '9Wu4k/DccBnvpLgpLtBk1OsdC3u6Qx78Zmgy4H+g5CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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