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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05c57206e29b49f805c28f484720b3e6aa12dc8987b11ff483a6aa556b576fb' 
  AND token = '3VBL89fzBb2ij3rMqTeh7sV06RD0jUgmO9rntWgbujY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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