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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b73bd79910c6f4a2e5a45251b885cc6346ce37c084af09c02cb3adbe8fd903' 
  AND token = 'UT0wPvXvh4amQVoq7vWqWfEmYHEwImHEaWKFxwUCkOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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