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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2870ed7f705323b2f5470fbb67f6a9ead3f6dad7260cff85cbf77c70b374481' 
  AND token = 'BpRE//6JnQy77NeMKFJbzyujtr6eY7YsGyKDrvjk/ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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