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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c3a3af5562b263e8d6daa6d5f1b4b6fce48624e006f7a373160f0f148d84da' 
  AND token = 'ZJzYYlqd+lycoE7GZdoDJ/0TKV3/i3yN53b5ezr9jOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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