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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85224a741fb019b3172c5253aea72e7d9f4b46ceb59b53be1adc87bd7d6c8e7f' 
  AND token = 'IZcD3rEQhg5sTpVULjlxppwYlyXskobmJFZdd8dWH7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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