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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6cc623034bdf9f0b6e73a90245152d45dd70ff3f03d2e4abe8bb9dcc0986b2' 
  AND token = '0CND0QMoUKTUdDx5S9I9T5wD4YftsqrimTgRe5NoZQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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