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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4f0954c3c6d8196705b7adf40da3817e36bd10c7c62e0909b83102a22e6157' 
  AND token = 'gd6PmEUJYh9sW7KogUlcZRVZ7eK3cwGReQTJ7QPn46o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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