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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261518597c283f218b2fbae82f5989ba59dc0cb978d93a4905a35f5f1bf60140' 
  AND token = 'mVRg600+hzqryHuFus/Sn5n1ZFtRsaFAkGit3DczhyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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