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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c61795ec8452726751f7b9aa7baa28321d06014347321a7d697931523ed2a0f' 
  AND token = 'ZdXMDWW+B/WrxkuA9UqdY2mgaBymR4aedv5CTjoHdv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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