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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fedbc3e4de42beea990d8dc8ea999e224572b1bf9f1ed2c29ef3148f56f8c6f6' 
  AND token = 'BgPnA8UiVDHzVw7sV5Rp8yUqy2DyFRlroVb9Dy+SzK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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