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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931cfbc3981a413a824382b55109ae811a18d0c264f8f0ac61fabf1f6053b6b3' 
  AND token = 'B8Lo8G/m3e3gPvdI6ArvGiZ6i0N8ZdOfLQo7bdX6QWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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