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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ebfa86dc84adbf4671551c2bc57bb9bc0ec6a3faa202073da5925d5399823f' 
  AND token = 'b1msct8/ZMsZWPQG17CMQGR+5XWCbSvbPWlF6lmc88c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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