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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69225238583a57e00419676904b5fa9836e2f28472b82e59e1890d9efb89b2df' 
  AND token = 'lRN8e2Q0xuM6/LJYAfm84zDumb73y7xivQWbLEKopjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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