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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6d53ac01e05c228ff1a6866ac1ab6e95ace9d494f368e3fdab58b8f1de03c9' 
  AND token = '2kkj33fwxbRhrTYh1IH3MzhwYA4l/DIqFfz7h8aYBGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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