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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59fca08f59aee916712942f250bde5448f56204f949c00e61f1bf7b91f992b64' 
  AND token = '0oKK+4mDy4l10ab2y3TWSdeyHel/51xTyOGkHjWDxBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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