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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cde94f7a9abfa65774bcd8cdb31628c0a3462516c87369d76b0fd209dc583d2' 
  AND token = 'AnbrfbkwySd5NcnSxFaoS+jw7mSQ36uegrve/jIlcJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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