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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd771f2f4a0da66edad39c769b9dc5b8c253fd98bf7f507835e0ee56e82331b8' 
  AND token = 'J13cinMwn7U4YQL5pqcHu/tv3DLk1W8FNrsD5l/NkIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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