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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bc86a187bc1e7171e98fe9524c4210e44814621d55d4dbf67630f0b55e621d' 
  AND token = 'bCWw8MaMU0VfbakTXEFt+VizqTvVnECJCl1snk34gUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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