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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab60a33ed59af55e2caf8b8dbc13f09b1177cdbccddac455ed9c50e7249d7b90' 
  AND token = 'ck27LvBZVxxJnVTf/gb5hLjGbni+UPIBxdtt+yXumb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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