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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b8e44769e9077c4bbec0bbcc6991b42606c4dc10cecee79764dc38660209e5' 
  AND token = 'AOM8rqor7aWYVX99d+XJ25gZRlpruIIwYc2abcjMBT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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